BOSTON, MA – The interim superintendent of the Boston public schools has tapped a former principal in Springfield to lead turnaround efforts at the Madison Park Technical Vocational High School in Roxbury. Kevin McCaskill, 53, former principal of the Roger L. Putnam Vocational Technical High School in Springfield and a Hartford administrator, will take over as executive director at Madison Park on July 1, the School Department said in a statement. “I really look forward to making this school the true jewel of the Boston public schools,” McCaskill said in an interview.